Zoo Station by David Downing

The sources provide excerpts from a novel focusing on Russell, an English journalist living in Nazi Berlin, who navigates a precarious existence while maintaining relationships with his German girlfriend, Effi, and his son, Paul. He is recruited by a Soviet agent to write propaganda articles favorable to the regime in exchange for desperately needed money, and simultaneously acts as an informant for the British Embassy. Russell becomes involved in trying to help a Jewish family, the Wiesners, escape Germany after the father is arrested, and he is implicated in the clandestine activities of an American journalist, Tyler McKinley, who is subsequently murdered after investigating a horrific Nazi euthanasia plan. The narrative culminates with Russell attempting to smuggle sensitive documents out of the country for the Soviets and the American's information to a contact, all while dealing with the pervasive threat of German and international intelligence agencies.